# Circle deflection

1. Jan 31, 2009

### cam875

how do u calculate what one circle does when it collides with another circle at a specific point on a specific heading? I need to know how to figure out the outbound angle that the circle will travel on after colliding.

2. Jan 31, 2009

### Espen

Isn't this just the reflection law, $$\theta_{inbound}=\theta_{outbound}$$ with theta measured on the tangent (plane) of the collision surface at the collision point?

3. Jan 31, 2009

### cam875

im not sure thats why im asking.